Sony Xperia Z3 D6633 Factory Unlocked, International Version, Black 4G LTE: LTE 700/800/850/900/1700/1800/1900/2100/2600 Display: 1080 x 1920 pixels, 5.2 inches (~424 ppi pixel density) Camera: 20.7 MP, 5248 &#x445; 3936 pixels, autofocus, LED flash CPU: Quad-core 2.5 GHz Krait 400 OS: Android OS, v4.4.4 (KitKat) Unlocked cell phones are compatible with GSM carriers such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint. This cell phone may not include a US warranty as some manufacturers do not honor warranties for international version phones. Please contact the seller for specific warranty information.